Keyboard stand



FIG. 1 is a perspective view in the collapsed state of a keyboard stand, showing my new design;

FIG. 2 is a perspective front view in the set-up state;

FIG. 3 is a perspective side view in the set-up state; and,

FIG. 4 is another perspective view in the collapsed state. 

The ornamental design for a keyboard stand, as shown and described. 